An investigation of formation of second phases in microalloyed, AZ31 Mg alloys with Ca, Sr and Ce

作者：Shang L^*; Jung I H; Yue S; Verma R; Essadiqi E

来源：Journal of Alloys and Compounds, 2010, 492(1-2): 173-183.

DOI：10.1016/j.jallcom.2009.11.159

• AZ31 alloy
• Ca-Sr-Ce microalloying
• Second phases
• EPMA
• FactSage (TM)

The present work studied the formation of new phases by adding alloying additions (Ca, Sr, and Ce) in AZ31 alloy at micro-levels (approximately 0.2 wt.% per element). Quantitative electron probe micro-analysis (EPMA) was used to identify the compositions of these phases; a comparison in the morphology and distribution of an identical phase in different alloy systems was made; and the thermodynamic software of FactSage (TM) was utilized to calculate the possible intermetallic phases during solidification. The results of EPMA showed the existence of phases other than Mg(17)(Al, Zn)(12) and Al(8)Mn(5) in AZ31 alloy, namely: Al(2)Ca, Al(2)Sr, Al(11) Ce(3), Al(8)CeMn(4), and Al(2)(Ca Sr); and these new phases were thermally stable at 450 degrees C for 10h. The morphology and distribution of second phases in different alloy systems were self-consistent. These phases were well predicted by FactSage (TM) with recent light alloy database.

• 出版日期2010-3-4